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I would love to auto start Bartender (by the way, excellent app that hides some of your notification area icons) when I unplug my external monitor from my Mac.

Is there any app or script that could do that?

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up vote 3 down vote accepted

Try ControlPlane. It allows you to trigger various actions, including launching applications, based on a variety of "evidence sources" (which include which monitors are connected). Have a look at the full feature list, but it should accomplish what you're looking for.

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This is PERFECT. Managed to implement what I wanted in a few minutes after installing. Thanks! – kolrie Dec 2 '12 at 4:11

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